∴y=45(80-x)+50x,
即y=5x+3600.
(2)∵两种型号的时装共用A种布料[1.1x+0.6(80-x)]米,共用B种布料[0.4x+0.9(80-x)]米,
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∴解之得40≤x≤44,
而x为整数,
∴x=40,41,42,43,44.
(3)由(2)知,x取40,41,42,43,44.因此有五种设计方案:
方案1:生产M种型号时装40套,N种型号时装40套;
方案2:生产M种型号时装41套,N种型号时装39套;
方案3:生产M种型号时装42套,N种型号时装38套;
方案4:生产M种型号时装43套,N种型号时装37套;
方案5:生产M种型号时装44套,N种型号时装36套.